Finding the Fourth Proportional to 10,128.90, 15,200.08 and 3,555.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,128.90 : 15,200.08 = 3,555.12 : x
2. Step 2: Convert to fraction form
   10,128.90/15,200.08 = 3,555.12/x
3. Step 3: Cross multiply
   10,128.90x = 15,200.08 × 3,555.12
4. Step 4: Simplify right side
   10,128.90x = 54,038,108.41
5. Step 5: Solve for x
   x = 54,038,108.41/10,128.90
6. Step 6: Final answer
   x = 5,335.04